Oil field water recycling system and method

Abstract

A system is used for treating contaminated water, that may include some amount of polyacrylamides, emulsified hydrocarbons, and sequestered divalent cations. The system includes at least one pre-treatment tank for initial processing of the contaminated water. Thereafter, the water may be fed to at least one chemical treatment tank fluidically connected to the pre-treatment tank. This treatment tank includes a chemical injection system connected to an interior thereof for introducing a variety break operations, coagulant addition operations, and / or flocculent addition operations. At least one clarifier is fluidically connected to the at least one chemical treatment tank, and includes a mechanical contaminant removal system. A filter skid is fluidically connected to the at least one clarifier, and includes a plurality of filter cartridges.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to and the benefit of U.S. Provisional Patent Application Ser. No. 61 / 454,213, filed Mar. 18, 2011; and is a continuation-in-part of U.S. patent application Ser. No. 12 / 792,164, filed Jun. 2, 2010, which claims priority to and the benefit of U.S. Provisional Patent Application Ser. No. 61 / 184,169, filed Jun. 4, 2009; all of which are entitled, “Oil Field Water Recycling System and Method,” the disclosures of which are hereby incorporated by reference herein in their entireties.INTRODUCTION[0002]Water, especially in the western United States and other arid regions, is a valuable resource. Many oil and natural gas production operations generate, in addition to the desired hydrocarbon products, large quantities of waste water, referred to as “produced water”. Produced water is typically contaminated with significant concentrations of chemicals and substances requiring that it be disposed of or treated before ...

AI Technical Summary

Benefits of technology

[0013]a) treating water with an effective amount of calcium carbonate and potassium hydroxide thereby reducing water hardness.

[0015]a) treating water with an effective amount of phosphoric acid and sodium phosphate thereby reducing water hardness and reducing a chain length of at least some polyacrylamides contained in the water.

Problems solved by technology

Produced water is typically contaminated with significant concentrations of chemicals and substances requiring that it be disposed of or treated before it can be reused or discharged to the environment.

Because of the very wide range of contaminant species as well as the different quality of produced water from different sources, efforts to create a cost effective treatment system that can treat or recycle the spectrum of possible produced water streams have been limited.

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